<template>
  <div>
    <!-- 顶部滑动条 -->
    <div id="slider" class="mui-slider">
      <div
        id="sliderSegmentedControl"
        class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted"
      >
        <div class="mui-scroll">
          <a
            :class="['mui-control-item', item.id == 0 ? 'mui-active' : '']"
            v-for="item in categorys"
            :key="item.id"
            @click="getImages(item.id)"
          >{{ item.title }}</a>
        </div>
      </div>

      <!-- 图片列表区域 -->
      <ul class="photo-list">
        <router-link v-for="item in imgList" :key="item.id" :to="'/home/photoinfo/' + item.id" tag="li">
          <img v-lazy="item.imgUrl" />
          <div class="info">
            <h1 class="info-title">{{item.title}}</h1>
            <h1 class="info-body">{{item.content}}</h1>
          </div>
        </router-link>
      </ul>
    </div>
  </div>
</template>
<script>
// 1. 导入 mui 的js文件
import mui from "../../lib/mui/js/mui.min.js";
export default {
  data() {
    return {
      categorys: [],
      imgList: []
    };
  },
  created() {
    this.getCategorys();
    //默认进入页面，就主动搜索 所有图片列表的数据
    this.getImages("");
  },
  mounted() {
    //当组件中的DOM结构被渲染好并放到页面中后，会执行这个 钩子函数
    //如果要操作元素了，最好在 mounted 里面，因为这时候的DOM元素是最新的
    // 2. 初始化滑动控件
    mui(".mui-scroll-wrapper").scroll({
      deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
    });
  },
  methods: {
    getCategorys() {
      this.$http.get("comment/getCategory").then(result => {
        if (result.body.state === "0") {
          // 手动拼接出一个最完整的 分类列表
          result.body.data.unshift({ title: "全部", id: 0 });
          this.categorys = result.body.data;
        }
      });
    },
    getImages(categoryId) {
      //根据 分类Id,获取图片列表
      this.$http
        .get("comment/getImages?categoryId=" + categoryId)
        .then(result => {
          if (result.body.state === "0") {
            this.imgList = result.body.data;
          }
        });
    }
  }
};
</script>
<style lang="scss" scoped>
* {
  touch-action: pan-y;
}

.photo-list {
  overflow: hidden;
  list-style: none;
  margin: 0px;
  padding: 10px;
  padding-bottom: 0px;
  li {
    background-color: #ccc;
    text-align: center;
    margin-bottom: 10px;
    box-shadow: 0 0 9px #999;
    position: relative;
    img {
      width: 100%;
      height: 300px;
      vertical-align: middle;
    }
    img[lazy="loading"] {
      width: 40px;
      height: 300px;
      margin: auto;
    }
    .info{
      color: white;
      text-align: left;
      position: absolute;
      bottom: 0;
      background-color: rgba(0, 0, 0, 0.4);
      max-height: 84px;
      .info-title {
        font-size: 14px;
      }
      .info-body {
        font-size: 13px;
      }
    }
  }
}
</style>